Wrong display of Aliases

On a NethServer release 7.9.2009 E-Mail-Server with 6 domains I found a weird behaviour:
Usernames, that contain some letters to the rigth like another username will show the alias of the longer user name:

  • 1st user is “rk”
  • 2nd user is “grk”
    –> aliases of “grk” show up on the username “rk” – see attached image

Apparently this does not affect mail delivery and appears to be a cosmetic bug